<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->
    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>
      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部" href="#" @click="getAll()">全部</a>
                </li>
                <li v-for="(subject,index) in oneSubjectList" :key="index">
                  <a
                    :title="subject.title"
                    href="#"
                    @click="searchOneSubject(subject.id,index)"
                    :class="{active: oneIndex == index}"
                  >{{subject.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14"></span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li v-for="(items,index) in twoSubjectList" :key="index">
                  <a
                    :title="items.title"
                    href="#"
                    :class="{active: twoIndex == index}"
                    @click="searchTwoSubject(items.id,index)"
                  >{{items.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <div class="clear"></div>
        </section>
        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>/
              <i class="c-666 f-fM">1</i>
            </span>
          </section>
          <section class="fl">
            <ol class="js-tap clearfix">
              <li :class="{currentClick: this.isClick===1}">
                <a title="销量" href="#" @click="sortByBuyCount()">销量</a>
              </li>
              <li :class="{currentClick: this.isClick===2}">
                <a title="最新" href="#" @click="sortByGmtCreate()">最新</a>
              </li>
              <!--              current orange-->
              <li :class="{currentClick: this.isClick===3}">
                <a title="价格" href="#" @click="sortByPrice()">
                  价格&nbsp;
                  <span class="el-icon-sort"></span>
                </a>
              </li>
            </ol>
          </section>
        </div>
        <div class="mt40">
          <!-- /无数据提示 开始-->
          <section class="no-data-wrap" v-if="data.total === 0">
            <em class="icon30 no-data-ico">&nbsp;</em>
            <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
          </section>
          <!-- /无数据提示 结束-->
          <article class="comm-course-list" v-if="data.total > 0">
            <ul class="of" id="bna">
              <li v-for="(item,index) in data.items" :key="index">
                <div class="cc-l-wrap">
                  <section class="course-img">
                    <img :src="item.cover" class="img-responsive" alt="听力口语" />
                    <div class="cc-mask">
                      <a :href="'/course/'+item.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                    </div>
                  </section>
                  <h3 class="hLh30 txtOf mt10">
                    <a
                      :href="'/course/'+item.id"
                      :title="item.title"
                      class="course-title fsize18 c-333"
                    >{{item.title}}</a>
                  </h3>
                  <section class="mt10 hLh20 of">
                    <span class="fr jgTag bg-green">
                      <i class="c-fff fsize12 f-fA">{{item.price === 0?'免费':item.price+'元'}}</i>
                    </span>
                    <span class="fl jgAttr c-ccc f-fA">
                      <i class="c-999 f-fA">{{item.buyCount}}人学习</i>
                      |
                      <i class="c-999 f-fA">{{item.viewCount}}评论</i>
                    </span>
                  </section>
                </div>
              </li>
            </ul>
            <div class="clear"></div>
          </article>
        </div>
        <!-- 公共分页 开始 -->
        <div>
          <div class="paging">
            <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
            <a href="#" title="首页" @click.prevent="changePage(1)">首</a>

            <a
              href="#"
              title="前一页"
              @click.prevent="changePage(data.current - 1)"
              :class="{undisable: !data.hasPrevious}"
            >&lt;</a>

            <a
              href="#"
              v-for="(page) in data.page"
              :key="page"
              :class="{current: data.current == page,undisable: data.current == page}"
              :title="'第'+page+'页'"
              @click.prevent="changePage(page)"
            >{{page}}</a>

            <a
              href="#"
              title="后一页"
              @click.prevent="changePage(data.current + 1)"
              :class="{undisable: !data.hasNext}"
            >&gt;</a>

            <a href="#" title="末页" @click.prevent="changePage(data.page)">末</a>
            <div class="clear"></div>
          </div>
        </div>
        <!-- 公共分页 结束 -->
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>
<script>
import courseApi from "@/api/course";

export default {
  data() {
    return {
      page: 1,
      data: {}, // 课程列表
      oneSubjectList: [], // 一级分类列表
      twoSubjectList: {}, // 二级分类列表
      searchObj: {}, // 查询表单对象
      oneIndex: -1,
      twoIndex: -1,
      buyCountSort: "",
      gmtCreateSort: "",
      priceSort1: "", // 升序
      priceSort2: "", // 降序
      id: 1,
      isClick: 1
    };
  },
  created() {
    this.getCourseCondition();
    this.getAllSubject();
  },
  methods: {
    // TODO 点击全部有些问题
    getAll() {
      this.searchObj = "";
      this.changePage(1);
    },
    // 查询所有课程
    getCourseCondition() {
      courseApi
        .getCourseListByCondition(1, 8, this.searchObj)
        .then(response => {
          this.data = response.data.data;
        });
    },
    // 查询所有一级分类加二级分类
    getAllSubject() {
      courseApi.getAllSubjectInfo().then(response => {
        this.oneSubjectList = response.data.data.list;
      });
    },
    // 分页
    changePage(page) {
      courseApi
        .getCourseListByCondition(page, 8, this.searchObj)
        .then(response => {
          this.data = response.data.data;
        });
    },
    // 点击一级分类查询对应二级分类
    searchOneSubject(id, index) {
      this.oneIndex = index;
      this.searchObj.subjectId = "";
      this.searchObj.subjectParentId = id;
      // 查询
      this.changePage(1);
      // 显示
      for (let i = 0; i < this.oneSubjectList.length; i++) {
        let oneSubject = this.oneSubjectList[i];
        if (id === oneSubject.id) {
          this.twoSubjectList = oneSubject.children;
        }
      }
    },
    searchTwoSubject(twoId, index) {
      this.twoIndex = index;
      this.searchObj.subjectId = twoId;
      this.changePage(1);
    },
    sortByBuyCount() {
      this.isClick = 1;
      this.buyCountSort = "1";
      this.gmtCreateSort = "";
      this.priceSort1 = "";
      this.priceSort2 = "";

      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort1 = this.priceSort1;
      this.searchObj.priceSort2 = this.priceSort2;
      this.changePage(1);
    },
    sortByGmtCreate() {
      this.isClick = 2;
      this.buyCountSort = "";
      this.gmtCreateSort = "1";
      this.priceSort1 = "";
      this.priceSort2 = "";

      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort1 = this.priceSort1;
      this.searchObj.priceSort2 = this.priceSort2;
      this.changePage(1);
    },
    // 降序排列
    sortByPrice() {
      this.isClick = 3;
      if (this.id === 1) {
        this.buyCountSort = "";
        this.gmtCreateSort = "";
        this.priceSort1 = "1";
        this.priceSort2 = "";
        this.id = 0;
        this.searchObj.buyCountSort = this.buyCountSort;
        this.searchObj.gmtCreateSort = this.gmtCreateSort;
        this.searchObj.priceSort1 = this.priceSort1;
        this.searchObj.priceSort2 = this.priceSort2;
        this.changePage(1);
      } else {
        this.buyCountSort = "";
        this.gmtCreateSort = "";
        this.priceSort1 = "";
        this.priceSort2 = "1";
        this.id = 1;
        this.searchObj.buyCountSort = this.buyCountSort;
        this.searchObj.gmtCreateSort = this.gmtCreateSort;
        this.searchObj.priceSort1 = this.priceSort1;
        this.searchObj.priceSort2 = this.priceSort2;
        this.changePage(1);
      }
    }
  }
};
</script>
<style scoped>
.active {
  color: red;
  font-size: 20px;
}

.hidden {
  display: none;
}

.currentClick {
  color: white;
  background: orange;
}

.show {
  display: block;
}
</style>
